Improvement in tool-grinding machines



M. L. MOWRER.

TOOL-GRINDING MACHINE.

Patented Nov. 9,1875.

No.169,8Z9.

I invent 01 M 97,

N.PETERS, PHOTO LTHOGRA UNITED STATES.

PATENT QFFIon MARTIN L. MOWRER, OF DAYTON, QHIO.

IMPROVEMENT IN TOdL-GRI'NDING MACHINES.

Specification forming part of Letters Patent N o. 1 69,829, dated November 9, 1875; application filed J nne 28, 1875.

To all whom it may concern:

Be it known that'I, MARTIN L. MOWRER, of the city of Dayton, in the county of Mont gomery and State of Ohio, have invented certain new and useful Improvements in Grinding-Machines, of which the following is a specification:

My invention relates to an improvement in the method of grinding tools, the object of which is to furnish means whereby any tool can be ground at any desired bevel. It consists in providing an adjustable angle and gage plate attached to the frame of the guides, so that it may be set to grind tools of different lengths, with almost any desired bevel to the edge of the tool.

It is here represented as employed to grind millpicks.

Figure, I is a perspective view of my improvement combined with a mill-pick grinder.

A represents the base of a .grinding-machine; B B, standards, upon which is mounted the grinding mechanism, which, in this case, consists of an emery-wheel, O, mounted on arbor c, which is revolved by means of spurgear E 6, turned by the handle F by the hand ofthe operator. G represents the angle gageplate, which has a series of angle-teeth placed in the. oblique face fronting the emery-Wheel, as shown in the drawing. S represents a slot,

made in the shank of the gage, through which a set-screw passes to fasten it to the grindingframe. This slot allows the gage-plate to be set nearer to or farther from the grinder, to accommodate the machine to tools of different lengths.

Angular steps, in the oblique front face of the gage-plate G are for the bottom end of the tool to rest in, and the tool is ground with the desired bevel, according to the angle of inclination at which it is held. Eachdifferent step grinds the bevel in a diflerent angle, and it may always be ground at the same angle. The number of steps and different degrees of inclination may, of course, be varied at pleas-- ure.

I claim as my invention- In combination with the frame A and wheel 0, the adjustable slotted angle-plate G, and the screw rod and nut S, said angleplate being providedwith a series of angleteet h in which one end of the tool is adapted to set in such position as to present its. other end to the stone 0 at any desired angle, substantially as described.

In testimony whereof I have hereunto set my. hand this 1st day of ,June, 1875.

MARTIN L. MOWRER.

Witnesses:

GEo. M. YOUNG, M. J. FINCH- 

